EP1993887A1 - Procede de repartition du freinage dans au moins un groupe de freins d'un aeronef - Google Patents
Procede de repartition du freinage dans au moins un groupe de freins d'un aeronefInfo
- Publication number
- EP1993887A1 EP1993887A1 EP07731132A EP07731132A EP1993887A1 EP 1993887 A1 EP1993887 A1 EP 1993887A1 EP 07731132 A EP07731132 A EP 07731132A EP 07731132 A EP07731132 A EP 07731132A EP 1993887 A1 EP1993887 A1 EP 1993887A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brakes
- braking
- group
- brake
- aircraft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004321 preservation Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 description 29
- 230000001133 acceleration Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
- B60T8/1703—Braking or traction control means specially adapted for particular types of vehicles for aircrafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/42—Arrangement or adaptation of brakes
- B64C25/426—Braking devices providing an automatic sequence of braking
Definitions
- the invention relates to a method of braking distribution in at least one group of brakes of an aircraft.
- the aircraft of a certain importance are generally equipped with a braking computer which, to ensure a given deceleration, generates a braking effort objective in response to either a support by the pilot on the brake pedals, or in response to a selection by the pilot of a determined deceleration level ("autobrake" function).
- This objective of braking force is in practice achieved by sending braking instructions to the power distribution members associated with the brakes, identical for all the brakes and which are such that the sum of the braking forces developed by the brakes in response to these braking instructions achieve the objective of braking force.
- the application of this overall braking effort is maintained long enough by the brake computer to dissipate by friction in the brakes energy required for the required deceleration of the aircraft.
- anti-slip protections consist in temporarily reducing the braking force on a brake if the corresponding wheel begins to slide. These corrections affect one or other of the wheels, without a global distribution strategy being implemented. Momentarily, the total braking effort may be less than the braking target.
- GB 1 585 321 also discloses a method for equalizing the energy dissipated between two brakes by calculating for each brake a rate of energy dissipated by producing the product of the torque generated by the brake by the criterion of rotation of the wheel, then incorporate this rate.
- This method is content to distribute a posteriori braking efforts between the two brakes, based on the energy already dissipated by these brakes.
- the invention relates to a distribution method for optimizing the use of the brakes.
- a method of managing the braking of an aircraft comprising a plurality of brakes comprising friction elements, comprising the steps of, for at least one group of brakes:
- Such a distribution of braking between the brakes of the group is not fixed a priori but may vary with each braking application to meet the operational criterion selected. Thus, unlike the known distributions, it is not possible to predict in advance the distribution of the braking force.
- the other operational objective comprises a preservation of elements of the aircraft loaded during braking by the brakes of the group.
- the other operational objective includes
- the other operational objective may comprise:
- FIG. 1 is a diagrammatic view of an aircraft comprising four main landing gears with braked wheels;
- FIG. 2 is a block diagram of a ground guidance architecture of the aircraft of FIG. 1 according to a particular mode of implementation of the invention;
- FIG. 3 is a detailed view of FIG. 2 illustrating the braking control
- FIG. 4 is a block diagram of a distribution within the same group, adaptable to the command illustrated in FIG. 3.
- the invention is hereby illustrated with reference to an aircraft such as that of FIG. 1 comprising two IG and ID main landing gear, two 2G and 2D fuselage main landing gear, and an auxiliary landing gear. with steered wheels.
- the main undercarriages 1G, 1D, 2G, 2D each carry four wheels fitted with brakes.
- the aircraft is further equipped with engines 4 and a drift 5.
- the invention is part of an aircraft ground guidance architecture illustrated in FIG. 2 which comprises a module for guiding the aircraft 10.
- the guiding module 10 receives as input a trajectories instruction. (which can, if necessary be rectilinear) and controls all the organs that can affect the ground path of the aircraft, that is to say the engines 4, the orientation of the wheels of the undercarriage 3 , departure 5, and, of course, the brakes of the main landing gear.
- the guidance module 10 generates orders for the engines 4, the drift 5 and the wheel orientation control of the undercarriage 3, and deduced by difference between the trajectory setpoint and the expected effects of the actions taken. by the aforementioned members in response to said commands a braking objective F and a yaw torque goal C to be achieved by the brakes.
- the trajectory instruction can take various forms:
- the trajectory setpoint in a pure braking mode, for example following a landing, will consist in specifying to the guiding module at least one given deceleration and a zero turning speed;
- the trajectory setpoint in a ground maneuvering mode, for example between the runway and the terminal, will consist in specifying to the guiding module at least one turning speed which varies at any moment in order to follow a determined trajectory.
- the braking objective F determined from the trajectory setpoint represents a setpoint, that is to say the evolutions in time of a braking force that the brakes should develop for the aircraft to follow the trajectory according to a movement (position, speed, acceleration) given.
- the objective of braking force represents one or more brakes of duration and intensity determined. At each brake stroke, it is possible to associate a total energy to be dissipated by all the brakes of the aircraft, obtained by temporal integration of the objective of braking force.
- the yaw torque goal C represents a setpoint, that is to say the changes in the yaw torque time that the brakes should develop for the aircraft to follow the trajectory in a movement (position, speed, acceleration) given.
- the yaw torque may for example be necessary to brake the aircraft in a turn.
- the brakes are controlled by a brake control module 11 which receives from the guiding module 10 the braking force objective F and the yaw torque objective C to be achieved by the brakes.
- the braking control module 11 From the braking force objective F and the yaw torque objective C, the braking control module 11 generates two braking levels Fg and Fd respectively:
- a group of right brakes 13 grouping the brakes carried by the right landing gear of the right wing ID and the landing gear of the right fuselage 2D.
- Dotted lines in FIG. 1 illustrate the composition of the left 12 and right 13 groups. It can be seen here that the left 12 and right 13 groups are symmetrical. According to the invention, the braking levels Fg and
- Fd are determined so that their sum is equal to the braking objective F and that their torque effect on the aircraft is equal to the goal of the yawing torque C.
- the yaw torque goal C may be specified by a difference between the effort to be developed by one group and the effort to be developed by the other groups.
- one or more of the brakes may only be able to generate a limited braking force, preventing the braking target F from reaching the target or the objective.
- a saturation signal is sent by the group concerned to the brake control module 11 which takes into account this saturation to generate braking levels Fg, Fd which allow to approach the best F, C lenses required given available braking capability.
- the brake control module 11 is programmed to prioritize the objectives, and may for example give priority to achieving the braking objective F rather than achieving the objective of torque. of this C.
- the brake control module 11 generates braking levels Fg, Fd which are adapted to respond to the braking objective F, but the effect of which on the yaw torque is as close as possible, taking into account braking capacity, torque lens C. More generally, it will seek braking levels Fg, Fd that maximize a simultaneous satisfaction rate F, C objectives, given possible limitations of one or more brakes.
- the left brake group 12 and the right brake group 13 have a mechanical action on the trajectory of the aircraft illustrated by the arrows in thick lines, as well as the motors 4, the steerable wheels of the auxiliary undercarriage 3 and the drift 5, the action of all these organs to influence the trajectory of the aircraft.
- Significant measurements of the path such as speed, longitudinal or angular acceleration, are then provided to the guide module 10 to form a feedback loop.
- the brake control module 11 is now detailed in relation to FIG.
- the brake control module 11 firstly comprises a logic unit 15 programmed to generate, from the braking objective F and the required yaw torque objective C, a nominal force setpoint Fnom and a left / right distribution setpoint ⁇ by means of which a first modulator 20 generates the braking level Fg for the left brake group 12 and a second modulator 21 generates the braking level Fd for the right brake group.
- the braking level Fg is obtained by producing the product ⁇ .Fnom
- the braking level Fd is obtained by performing the product (1- ⁇ ) .Fnom.
- the logic unit 15 is programmed to, in the event of saturation of one or other of the groups of brakes, modulate the nominal force setpoint Fnom and the distribution setpoint ⁇ to get as close as possible to the objectives F 1 C, taking into account the available braking capacity.
- the brakes can exert on the aircraft a braking force and a pair of yaw. Note that the distribution thus made is not fixed but varies over time.
- the knowledge of the braking level of a group makes it possible to estimate, by temporal integration of the braking level, the energy to be dissipated by the brakes of this group.
- the grouping logic of the brakes according to the invention can be pushed to a higher level by distinguishing subgroups in a group.
- a first subgroup 16 composed of the brakes equipping 1 'main landing gear left wing IG
- a second subgroup 17 composed of the brakes equipping 1' undercarriage main left fuselage 2G.
- the sum of the braking sub-levels Fv and Fb is equal to the braking level Fg.
- the distribution control module 18 takes into account the saturation signals coming respectively from the brakes of the first subgroup 16 and the brakes of the second subgroup 17 to calculate the distribution coefficient ⁇ . Thus, if the brakes of one of the subgroups saturate, it is possible to switch the braking force on the brakes of the other subgroup. If this switchover is no longer sufficient to reach the left braking setpoint Fg, the distribution control module 18 generates a saturation signal of the left brake group 12.
- all the brakes in the group should generate unit braking forces such as the resultant of the unit forces. braking developed by each of the brakes reaches the required braking level.
- the different braking unit forces are determined to satisfy a given operational criterion, while complying with the level of braking required, taking into account, of course, the braking capacity available.
- the operational criterion adopted is the minimization of the wear suffered by the friction elements of the brakes of the group. It is known that the carbon friction elements have a wear rate which depends on the temperature of the friction elements. If ⁇ T k is the increase of the temperature of the brake k during the braking to come, the wear on the brake k will be worth
- x is the rate of wear depending in particular on the temperature.
- a thermal model of the brake is used which, as a function of an energy AE k dissipated by the brake, calculates the temperature increase AT k .
- M k is the mass of the friction elements of the brake k, considered constant during braking
- Cp the heat capacity of the constituent material of the friction elements of the brake k.
- the total energy AE to be dissipated by the brakes of the group is of course equal to the sum of the energies dissipated by each brake.
- the total energy to be dissipated by the brakes is given by temporal integration of the braking force objective of the group, as already explained.
- the minimization of the wear amounts to seeking for each of the brakes of the group the energies AE k to be dissipated which minimize the quantity: k under the constraint
- each distribution is represented by a list of coefficients (as well as brakes in the group) whose sum is equal to 1. For example, if the group has two brakes, we can consider the following distributions:
- the minimization consists in calculating for each arbitrary distribution R 1 the corresponding energies AEJ 1 for each of the brakes, then the wear U k 'of each of the brakes produced by the dissipation of the corresponding energy.
- the minimization of the wear thus described concerns all the brakes of the same group.
- This operational criterion can be applied for each of the groups of brakes, in order to obtain a group-by-group minimization of the wear of the friction elements.
- the minimization of group-by-group wear can lead to a result which is not optimal from the point of view of all the brakes of the aircraft.
- the operational criterion of minimizing wear is according to the invention generalized to be applied to all the brakes of the aircraft simultaneously, while respecting, for each group, the required level of braking force.
- the operational criterion of minimizing wear is according to the generalized invention not only for all the brakes for a given braking, but also for all the predictable braking along the trajectory. For this, it is necessary to determine in advance the predictable braking, and therefore the energy to be dissipated for each group of brakes, which makes it necessary to know the entirety of the probable course of the aircraft on the airport.
- This knowledge can come either from the storage of the possible route (s) on the airport, or from a statistical study on a typical route for this or that airport and specifying the average number of braking operations and the average intensity of those -this.
- a movement (position, speed, acceleration) of the aircraft along this path is determined and the braking, yaw torque and energy objectives to be dissipated by the brakes are deduced therefrom.
- the braking distribution according to the invention remains compatible with the implementation of an anti-slip protection for each of the braked wheels.
- a braking effort lens F and a yaw torque goal C are set, the invention also covers the situation where only one of the objectives is set, for example the objective of braking force F. In this case, it is sufficient to arbitrarily set the goal of yaw torque C to zero.
- the operational criterion adopted for the application of braking is the minimization of the wear of the friction elements
- other operational criteria may be retained.
- the search for the distribution which leads to the application of braking force as gradually as possible in order to improve the comfort of the passengers or to preserve the operational elements of the aircraft which suffer from - rightly the braking force (the landing gear, the attachments of the undercarriage on the aircraft, the associated tires ).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Regulating Braking Force (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0602181A FR2898333B1 (fr) | 2006-03-13 | 2006-03-13 | Procede de repartition du freinage dans au moins un groupe de freins d'un aeronef |
PCT/FR2007/000436 WO2007104861A1 (fr) | 2006-03-13 | 2007-03-13 | Procede de repartition du freinage dans au moins un groupe de freins d'un aeronef |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1993887A1 true EP1993887A1 (fr) | 2008-11-26 |
EP1993887B1 EP1993887B1 (fr) | 2015-12-09 |
Family
ID=37399785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07731132.2A Active EP1993887B1 (fr) | 2006-03-13 | 2007-03-13 | Procede de repartition du freinage dans au moins un groupe de freins d'un aeronef |
Country Status (7)
Country | Link |
---|---|
US (1) | US8311685B2 (fr) |
EP (1) | EP1993887B1 (fr) |
CN (1) | CN101331041B (fr) |
BR (1) | BRPI0702867B1 (fr) |
CA (1) | CA2611132C (fr) |
FR (1) | FR2898333B1 (fr) |
WO (1) | WO2007104861A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2918637B1 (fr) * | 2007-07-09 | 2010-01-29 | Airbus France | Systeme d'egalisation des energies de freinage. |
CN105226284B (zh) | 2009-07-01 | 2017-11-28 | 巴斯夫欧洲公司 | 超纯合成碳材料 |
FR2959483B1 (fr) * | 2010-04-28 | 2012-06-01 | Messier Bugatti | Procede de gestion d'une liaison au sol d'un aeronef. |
FR2973761B1 (fr) * | 2011-04-05 | 2013-04-05 | Messier Bugatti | Procede de repartition de couple de freinage entre des roues freinees portees par au moins un atterrisseur d'un aeronef. |
FR3000003B1 (fr) * | 2012-12-21 | 2016-12-23 | Messier Bugatti Dowty | Procede de gestion du freinage d'un aeronef. |
GB2540183A (en) | 2015-07-08 | 2017-01-11 | Airbus Operations Ltd | Braking control system for an aircraft |
EP3359433B1 (fr) | 2015-10-07 | 2021-08-18 | Meggitt Aircraft Braking Systems Corporation | Diagnostic et pronostic de condition de frein d'aéronef |
GB2554097A (en) | 2016-09-20 | 2018-03-28 | Airbus Operations Ltd | Brake wear reduction apparatus |
US10543909B2 (en) | 2017-09-11 | 2020-01-28 | Goodrich Corporation | System and method for aircraft electric taxi brake optimization |
GB2576937A (en) * | 2018-09-07 | 2020-03-11 | Airbus Operations Ltd | Controlling aircraft wheel brakes |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1585321A (en) * | 1978-01-18 | 1981-02-25 | Boeing Co | Brake control systems for vehicles |
US6604708B1 (en) * | 1989-12-26 | 2003-08-12 | The Boeing Company | Carbon brake wear for aircraft |
ES2338099T3 (es) * | 2000-08-04 | 2010-05-04 | Meggitt Aerospace Limited | Supervision del estado de los frenos. |
CN2458237Y (zh) * | 2000-10-17 | 2001-11-07 | 范登高 | 飞机着陆紧急制动装置 |
DE10316090A1 (de) * | 2003-04-09 | 2004-10-28 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Reduzierung der Bremslast an wenigstens einer Radbremse |
CN1544291A (zh) * | 2003-11-24 | 2004-11-10 | 战 李 | 飞机中置制动法及其装置 |
WO2005087563A1 (fr) * | 2004-03-12 | 2005-09-22 | Airbus Uk Limited | Systeme de freinage perfectionne |
FR2869014B1 (fr) * | 2004-04-19 | 2006-07-07 | Messier Bugatti Sa | Procede de freinage d'un aeronef a plusieurs roues freinees |
US8634971B2 (en) * | 2009-05-05 | 2014-01-21 | Goodrich Corporation | Brake wear control system |
-
2006
- 2006-03-13 FR FR0602181A patent/FR2898333B1/fr not_active Expired - Fee Related
-
2007
- 2007-03-13 US US11/917,160 patent/US8311685B2/en active Active
- 2007-03-13 CA CA002611132A patent/CA2611132C/fr active Active
- 2007-03-13 BR BRPI0702867A patent/BRPI0702867B1/pt not_active IP Right Cessation
- 2007-03-13 CN CN2007800006773A patent/CN101331041B/zh not_active Expired - Fee Related
- 2007-03-13 EP EP07731132.2A patent/EP1993887B1/fr active Active
- 2007-03-13 WO PCT/FR2007/000436 patent/WO2007104861A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007104861A1 * |
Also Published As
Publication number | Publication date |
---|---|
BRPI0702867A (pt) | 2008-04-01 |
US8311685B2 (en) | 2012-11-13 |
FR2898333A1 (fr) | 2007-09-14 |
EP1993887B1 (fr) | 2015-12-09 |
FR2898333B1 (fr) | 2008-06-06 |
BRPI0702867B1 (pt) | 2018-10-30 |
CA2611132C (fr) | 2009-12-22 |
WO2007104861A1 (fr) | 2007-09-20 |
CN101331041B (zh) | 2013-04-10 |
US20080201025A1 (en) | 2008-08-21 |
CN101331041A (zh) | 2008-12-24 |
CA2611132A1 (fr) | 2007-09-20 |
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